Mysterious sickness in my flock!

I just started my coup this year. I chose my chicks and raised them from a week old and younger. My husband and I also went to poultry auctions and acquired a few birds this way as well. Somewhere along the line we brought something into the coop, even after we quarantined and checked over any new additions.

Here is what is going on:

Runny noses (beaks)

Wheezing of some sort

Neck stretching (to breathe better)

Eyes swelling

Eyes getting really watery

Eyes gooping up and staying closed

Eyes pussing

Death

This might not be the exact order. Here I what I have done-

I have researched, read books and talked to vets and people who raise chickens. Unfortunately there is nOt a vet in the area that can come look t them or that I can go to, I don't know why, there are many people who have chickens here.

I have tried putting oxine in a humidifier and putting them in a small area to insure they breathe it in. This works a little for some and leaves others with goopy eyes. I have swabbed throats to make sure there is not blockage or blood.
I have given them duramycin an vitamins and electrolytes but not at the same time, and I have done vitamins and oxine mix in water but then the eyes got worse so I went back to duramycin.

Please any ideas are welcomed! They are currently on medicated chick starter, even the adults. They have duramycin in water, and I'm still "fogging" them with the oxine...

You can contact zoologix and they will send a kit to collect a tracheal swab send it back to them and they can test for all respiratory illness or most of them anyways. My chickens had the same symptoms and turned out they had ort. About a hundred bucks for the test but at least you know what your dealing with.

I forgot to mention that we also bought a few chickens from an auction and that is how our flock caught ort. A lady that replied to my post suggested taking a bird from the existing flock and adding it to the ones in quarantine before adding them to the whole flock.